// State shared between views: who is signed in, the user list, and the open
// queue that drives the badges.

import * as api from './api.js';

export const state = {
  me: null, // { user, has_password }
  // How the server can be signed in to. The defaults are an older server's
  // answer: passwords, no single sign-on.
  auth: { password_login: true, oidc: { enabled: false, name: '' } },
  open: [], // the default queue: open, not snoozed
  teams: [], // the teams the viewer belongs to, each with their role
  // Which team the whole app is scoped to right now; null means "All teams".
  // Set only through setSelectedTeam below, never assigned directly, so every
  // view stays in sync and the choice is remembered across reloads.
  selectedTeamID: loadSelectedTeam(),
};

const SELECTED_TEAM_KEY = 'terdut.selectedTeam';

function loadSelectedTeam() {
  try {
    const raw = localStorage.getItem(SELECTED_TEAM_KEY);
    return raw ? Number(raw) : null;
  } catch {
    return null; // storage unavailable, or nothing saved yet
  }
}

// Callbacks to run whenever the selected team changes, so every view that
// cares — the queue's filter, the Team settings page, the selector's own
// trigger — stays in sync without a general event bus, following the one
// precedent for this in the codebase: onboarding.js's onRerender.
const teamListeners = [];
export function onTeamChange(cb) {
  teamListeners.push(cb);
}

// setSelectedTeam changes which team the app is scoped to (id, or null for
// "All teams"), persists it — a durable preference, unlike the per-tab
// sessionStorage filter this replaces — and tells every registered listener.
export function setSelectedTeam(id) {
  state.selectedTeamID = id;
  try {
    if (id == null) localStorage.removeItem(SELECTED_TEAM_KEY);
    else localStorage.setItem(SELECTED_TEAM_KEY, String(id));
  } catch {
    /* storage unavailable */
  }
  for (const cb of teamListeners) cb();
}

// The team whose schedule and settings the views act on: the selected team,
// falling back to the first one the viewer belongs to — which is everybody's
// only team until somebody makes a second, or the stored selection naming a
// team the account has since left.
export function currentTeam() {
  const teams = state.teams || [];
  return teams.find((t) => t.id === state.selectedTeamID) || teams[0] || null;
}

export function myID() {
  return state.me ? state.me.user.id : null;
}

// The user list changes rarely; it is fetched once and then at most every
// five minutes, for the assign sheet and for display names.
let usersCache = null;
let usersAt = 0;
export async function users() {
  if (!usersCache || Date.now() - usersAt > 5 * 60 * 1000) {
    usersCache = await api.users();
    usersAt = Date.now();
  }
  return usersCache;
}

export async function loadTeams() {
  state.teams = await api.teams();
  // A stored id that no longer names one of the account's teams — left it, or
  // this is simply a different account signed in on the same browser — is as
  // good as unset.
  if (state.selectedTeamID != null && !state.teams.some((t) => t.id === state.selectedTeamID)) {
    state.selectedTeamID = null;
  }
  return state.teams;
}

export function reset() {
  state.me = null;
  state.open = [];
  state.teams = [];
  usersCache = null;
}